Oil Pressure Switch
The engine oil pressure switch is located on the engine
near the oil filter (Fig.52). The oil pressure switch is a
normally closed switch that opens with pressure.
The oil pressure switch should open at approximately 8
2
PSI (0.56 kg/cm ).
The TEC controller monitors the operation of the oil
pressure switch.Theswitchanditscircuit wiring should
be tested as a controller input with the Diagnostic Dis-
play (see Special Tools and Troubleshooting in this
chapter).
2
1
Iflowengine oilpressure allowed theoil pressure switch
to close during engine operation, the Diagnostic light
can be used to identify the fault (see Diagnostic Light in
the Troubleshooting section of this chapter).
Figure 52
1.
Oil filter
2.
Oil pressure switch
Testing
NOTE: Refer to Kubota Workshop Manual, Diesel En-
gine, 05--E3B Series at the end of Chapter 3 -- Kubota
Diesel Engine for information regarding engine lubrica-
tion system and testing.
1.
pressure indicator light on the control panel should be
illuminated.
Turn the ignition switch to the RUN position. The oil
2.
If the indicator light is not illuminated, open hood to
gain access to engine.
3.
the wire harness connector from the switch.
Locate oil pressure switch on engine and disconnect
4.
the disconnected wire to the engine block.
With the ignition switch in the RUN position, ground
5.
Ifthe indicator light comes on,theoilpressure switch
is faulty.
6.
check the oil pressure indicator light and circuit wiring
(see Indicator Lights in this section).
If the indicator light does not come on after step 5,
7.
connector to the oil pressure switch. Lower and secure
hood.
After testing is completed, connect the wire harness
Groundsmaster 4300--D
Page 5 -- 41
Electrical System
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